user mode : page walk

[Martins3]

• page flags
• PDX
• level
• pgroot
  • cr3 for mips ?
• vm.c : dune_vm_default_pgflt_handler : we will not handle it until I finished hello world

[Martins3]

• I don't know what's the consequence of the absence of PTE_U?
  • how MIPS distinguish user mode and kernel mode?

I Will check this problem in jump kernel

[Martins3]

• hugepage

	CREATE_BIG = 2,
	CREATE_BIG_1GB = 3,

chen huacai's book: P275 : Loongson only support PMD hugepage

[Martins3]

#define pte_present(pte)	(pte & (_PAGE_PRESENT | _PAGE_PROTNONE))

• PN bit in flags

[Martins3]

• maybe Makefile depending chain, check it and test it (don't run it)
• #define _GNU_SOURCE ???

[Martins3]

• silent write

static inline pte_t pte_wrprotect(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_WRITE | _PAGE_SILENT_WRITE);
	return pte;
}

static inline pte_t pte_mkclean(pte_t pte)
{
	pte_val(pte) &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
	return pte;
}